What does the cryptic crossword clue "Train reversing into mobile unit, erroneously (7)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Train reversing into mobile unit, erroneously (7)

Telegraph Prize Cryptic #3204 | 14 Across | 2023-03-19 flower

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